Classified and Section 185A Data areas not included. "Section 185A" was
previously called "Transitional". Prior Designation retained by operation
of Law, but without measured violations. The former 1-hour ozone
designations and classifications as of June 15, 2004, are being retained in
subpart C of Part 81 for purposes of the anti backsliding provisions of 40
CFR 51.905. 40 CFR 51.905(c) references subpart C of part 81 for the areas
affected by the anti-backsliding regulation.